have a 99 Audi A3 1.8T petrol (AGU engine) the car has just done 100,000 miles
I have recently been having an intermittent problem.
I can be driving along normally then for no apparent reason when I accelerate the car hesitates and feels as if its missfiring, it lasts for varying amounts of time then disappears. When the car is stationary with the bonnet up I can see the engine appear to misfire causing it to jerk every so often causing a popping/spluttering noise from the exhaust. This doesnt always happen so cant put my finger on what it is. It doesnt seem to be there when travelling at motorway speeds, only when I put my foot down to pick up speed. A couple of times I have been sat at lights and the revs drop to almost stall point but then it corrects itself. last week it was really bad causing the mpg reading to drop to 14mpg but has gradually risen back to normal since then!
My dad is a retired police mechanic and he cant figure it out. He has a snap on diagnostic machine which doesnt pick up any problems, neither do I get any warning lights on the dash.
I have been trying to fix the problem but I am running out of time, money and patience as it isnt a consistent problem.
Not sure if it means anything but it has been worse since I serviced it a week ago, I changed the oil & filter, air filter & spark plugs.
Sinced the problem started I have checked the coil packs, changed the MAF sensor and the pre cat lambda sensor but still havnt cured it!
Any ideas?
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No need to post this in two places at once. Technical is the place for this one, where you get more replies.
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